Steamp-Iiuts of East Africa. H>U 



June 28t!i, TJll, niul preacntod by liiin to the National 

 (Jollection. 



There is no difficulty in distinguishing^ this new form from 

 the El^on species; the very much larger size, lighter colour, 

 and more arched skull are characters that at once serve to 

 distinguish percivali from jdcJcsont. Tlio lamina formula is 

 sufficient to separate it from dartmouthi, tj/jncs, and fortior, 

 while the double grooving of the lower incisors indicates 

 plainly that it cannot bo considered a moml)er of the lliomasl 

 group, with which it has a number of features in common. 



Group 3. 

 wj' with 8 lamina; . 



(21) Otomys typus, Heug. 



Oreotn;/x ti/ptis, Heugliu, Ileis. N. Ost-Afr. ii. p. 76 (1877). 

 Otumys deyimi, Tlios. P. Z. S. 1902, ii. p. oil. 



About equal in size to dartmouthi and percivali ; the pre- 

 sence of 8 lamime in »?i' easily distinguishes this Abyssinian 

 speeies from dartmouthi, jacksoni, and percivali. 



In general colour very like 0. t. S(]ualus, dorsal surface 

 brownish buff; head and flanks strongly tinged with buff, 

 yellow rings around eyes very conspicuous. Backs of hands 

 and feet dirty cream-buff. 



Skull arched, but not so markedly as in the last species. 

 Molars large, jh^ with 8 lamina3. 



Dimensions (from a spirit-specimen) : — 



Head and body 161 mm.; tail 90; hind foot 28-5; 

 ear 22. 



Skull (type of degeni) : length from back of interparietal 

 to tip of nasals 36*2 ; greatest breadth 19*7 ; nasals, greatest 

 length 16'5; greatest breadth across anterior expansion I'D; 

 palatilar length 17'7 ; length of palatal foramina T'-l ; length 

 of n|)per molar series from front alveolar border to back of 

 7n 10-3, crowns 8-2. 



Ilab. Shoa, Abyssinia. 



Thomas has already pointed out* that his degeni is 

 identical with iypus of lleuglin, the original descri|)tion 

 given l)y lleuglin being '* grossly inaccurate." Wroughton 

 in his paper followed this view, and it seems best to adopt it 

 here. The above description is taken from the type-specimen 

 of dcijeni, which we must now accept as representing (ypus. 



* Ann. & Map. Nat. Hist. (7) vol. xviii. p. 302 (IDOG). 



